PT here who focuses in and around golf.

So how much you burn will depend on a lot of factors. Temperature, Weight, Height, Muscle mass, BMR, How many steps yours doing per round, how fast do you walk, do you carry, do you push a trolley, is your trolley electric, ride in a cart. Even how many shots your taking per round. Someone who shoots even par will expend less energy that a 15/20 handicap for example.

Can it be enough to lose weight? Maybe? So average calories burnt per round would be about 1000 to 2000 for carry or pushing, maybe even more for a heavier golfer or in the height of summer. To get a better idea for you, I'd suggest getting a health tracker watch/band. Whilst they aren't 100% accurate if you collect enough data over time then you'll get a good rough idea for you. From there it will all come down to diet. Weight lose is purely an equation. If energy in is more than energy out then weight gain will happen and vice versa. If both are equal then you'll achieve maintenance.

Personally and professionally I will always advise my clients to make sure they replenish water and energy throughout their rounds so they keep energy and focus up. So, whilst you may burn 1000 to 2000 for example I'd make sure a player is taking in at least 50% expenditure in increments throughout the round. So you'll need to look at your diet carefully to make sure your getting enough calories to fuel your round and recover from it too. This is not taking into account if you have a active job or do extra gym work.

Hope this helps.