Spirited and fit? Yes, possibly (6)
I believe the answer is:
feisty
'spirited' is the definition.
('feisty' can be similar in meaning to 'spirited')
'fit? yes possibly' is the wordplay.
'possibly' indicates an anagram.
'fit'+'yes'='fityes'
'fityes' with letters rearranged gives 'FEISTY'.
'and' is the link.
(Other definitions for feisty that I've seen before include "Lively; determined" , "Spirited; quarrelsome" , "Spirited, exuberant" , "Spirited -- argumentative" , "Confident, high-spirited (US)" .)