Basil, possibly, taken in by another boy (4)
I believe the answer is:
herb
'basil' is the definition.
(basil is an example)
'taken in by another boy' is the wordplay.
'taken in by' says the answer is hidden in the clue.
'HERB' is hidden within 'another boy'.
'possibly' is the link.
(Other definitions for herb that I've seen before include "plant with useful properties" , "Plant used in cooking" , "bay perhaps" , "Thyme, for example" , "'Sage or rosemary, say (4)'" .)