Get thanks when opening a can (6)
I believe the answer is:
attain
'get' is the definition.
(attaining is a kind of getting)
'thanks when opening a can' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'when opening' is an insertion indicator (some letters open a gap in others).
'can' becomes 'tin' (both are metal containers).
'a'+'tin'='atin'
'ta' put into 'atin' is 'ATTAIN'.
(Other definitions for attain that I've seen before include "Succeed in getting or doing" , "Achieve with effort" , "Reach (a specified age)" , "Succeed in accomplishing; reach" , "Reach objective or ambition" .)