Is suitable only in spasms (4)
I believe the answer is:
fits
This might be a double definition.
'is suitable' is the first definition.
(I've seen this in another clue)
'only in spasms' is the second definition.
The definition and answer can be both states of affairs as well as being plural nouns.
Maybe there's an association between them I don't understand?
Can you help me to learn more?
(Other definitions for fits that I've seen before include "Sudden uncontrollable attacks" , "Prepares" , "short bouts" , "Is of the right shape and size" , "feels comfortable" .)