React badly, but provide what is needed (5)
I believe the answer is:
cater
'provide what is needed' is the definition.
(I've seen this in another clue)
'react badly' is the wordplay.
'badly' indicates an anagram.
'react' anagrammed gives 'CATER'.
'but' acts as a link.
(Other definitions for cater that I've seen before include "Supply provisions" , "Provide food etc" , "Supply food for parties" , "Provide food and drink (for an event)" , "so put out food?" .)