Pink for a boy! (5)
I believe the answer is:
lance
I believe this is a double definition.
'pink' is the first definition.
(thesaurus)
'a boy' is the second definition.
'for' acts as a link.
(Other definitions for lance that I've seen before include "Long pointed weapon of old" , "Long weapon; prick" , "Pierce (a boil)" , "Surgical knife" , "A horse soldier's spear" .)