Longed to turn each key (5)
I believe the answer is:
ached
'longed' is the definition.
('ache' can be a synonym of 'long')
'turn each key' is the wordplay.
'turn' indicates anagramming the letters.
'key' becomes 'd' (musical key).
'each' anagrammed gives 'ache'.
'ache'+'d'='ACHED'
'to' acts as a link.
(Other definitions for ached that I've seen before include "suffered" , "Hurt" , "Yearned" , "Did long" , "Throbbed" .)