Mad Max — or spy getting fit (8)
I believe the answer is:
paroxysm
'fit' is the definition.
(I know that fit can be written as paroxysm)
'mad max or spy' is the wordplay.
'mad' is an anagram indicator.
'max'+'or'+'spy'='maxorspy'
'maxorspy' with letters rearranged gives 'PAROXYSM'.
'getting' is the link.
(Other definitions for paroxysm that I've seen before include "Seizure" , "Spasm" , "Uncontrollable fit (of giggles, coughing etc)" , "Fit of giggling" , "Sudden outburst, of coughing say" .)