Longed for an aspirin? (5)
I believe the answer is:
ached
'longed' is the definition.
('ache' can be a synonym of 'long')
'an aspirin?' is the wordplay.
'an' becomes 'a'.
'aspirin?' becomes 'ched' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a'+'ched'='ACHED'
'for' is the link.
Can you help me to learn more?
(Other definitions for ached that I've seen before include "Throbbed" , "Had a continuous pain" , "suffered" , "Felt a dull pain" , "Hurt" .)