To get a tin-opener to work requires a certain finesse (4)
I believe the answer is:
tact
'a certain finesse' is the definition.
'tact' can be an answer for 'finesse' (I've seen this in another clue). I'm not certain of the 'a certain' bit.
'to get a tin-opener to work' is the wordplay.
'to get' is a charade indicator (letters next to each other).
'opener' suggests taking the first letters.
'to work' becomes 'act' (synonyms).
The first letter of 'tin' is 't'.
't' next to 'act' is 'TACT'.
'requires' acts as a link.
Can you help me to learn more?
(Other definitions for tact that I've seen before include "Skill in dealing with people" , "Sensitivity, diplomacy" , "Consideration and sensitivity" , "Diplomatic sensitivity" , "Understanding" .)