Blonde to approach best place for swingers? (7)
I believe the answer is:
fairway
'best place for swingers?' is the definition.
(part of a golf course - golfers swing clubs)
'blonde to approach' is the wordplay.
'blonde' becomes 'fair' (similar in meaning).
'to approach' becomes 'way'.
'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" .)