Strength in golf decreasing? (7)
I believe the answer is:
ironing
'decreasing?' is the definition.
(de-creasing: removing creases)
'strength in golf' is the wordplay.
'strength' becomes 'iron' (I've seen this before).
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'iron'+'in'+'g'='IRONING'
(Other definitions for ironing that I've seen before include "Items to decrease" , "having pressing business" , "Household task" , "Smoothing - removing wrinkles" , "Making clothes smooth" .)