Pain's double before tips from golf expert (6)
I believe the answer is:
twinge
'pain's' is the definition.
(twinge is a kind of pain)
'double before tips from golf expert' is the wordplay.
'double' becomes 'twin' (I've seen this before).
'before' means one lot of letters go next to another.
'tips from' says to take the initial letters (I've seen 'tip from' mean this).
The initial letters of 'golf expert' is 'ge'.
'twin'+'ge'='TWINGE'
(Other definitions for twinge that I've seen before include "Slight ache" , "Pinch" , "Qualm" , "Small pain eg from conscience" , "A slight stab of pain" .)