Can help one's headache when pickled in Paris (7)
I believe the answer is:
aspirin
'can help one's headache' is the definition.
I know that 'headache' relates to this answer.
'pickled in paris' is the wordplay.
'pickled' indicates anagramming the letters (I've seen this in other clues).
'in'+'paris'='inparis'
'inparis' anagrammed gives 'ASPIRIN'.
'when' is the link.
Can you help me to learn more?
(Other definitions for aspirin that I've seen before include "Common analgesic drug" , "Pain-relieving drug made in Paris" , "Anti-inflammatory drug" , "Anti-inflammatory tablet" , "Common drug in Paris" .)