Golfer's target, reasonable distance (7)
I believe the answer is:
fairway
'golfer's target' is the definition.
'reasonable distance' is the wordplay.
'reasonable' becomes 'fair' ('fair' can be a synonym of 'reasonable').
'distance' becomes 'way' (way is a kind of distance).
'fair'+'way'='FAIRWAY'
(Other definitions for fairway that I've seen before include "Golf course area between tee and green" , "Part of golf course between tee and green" .)