Strong and healthy or alternatively bankrupt (6)
I believe the answer is:
robust
'strong and healthy' is the definition.
(I've seen this in another clue)
'or alternatively bankrupt' is the wordplay.
'alternatively' indicates an anagram.
'bankrupt' becomes 'bust' (I've seen this in another clue).
'or' with letters rearranged gives 'ro'.
'ro'+'bust'='ROBUST'
(Other definitions for robust that I've seen before include "Physically strong" , "Unlikely to break" , "Athletic" , "Strong and healthy" , "Sturdily built" .)