Guide's sister holding golf peg (5)
I believe the answer is:
steer
'guide's' is the definition.
(synonyms)
'sister holding golf peg' is the wordplay.
'sister' becomes 'sr' (abbreviation as in names of nuns).
'holding' is an insertion indicator.
'golf peg' becomes 'tee' (I've seen this before).
'sr' going around 'tee' is 'STEER'.
(Other definitions for steer that I've seen before include "Manoeuvre" , "bovine creature" , "Reset so as to direct" , "bovine individual?" , "give guidance" .)