One way or another, ring me during the performance (7)
I believe the answer is:
somehow
'one way or another' is the definition.
(I've seen this before)
'ring me during the performance' is the wordplay.
'ring' becomes 'o'.
'during' means one lot of letters goes inside another.
'the performance' becomes 'show' (I've seen this before).
'o'+'me'='ome'
'ome' placed inside 'show' is 'SOMEHOW'.
(Other definitions for somehow that I've seen before include "In a way not yet specified" , "One way or another" , "For some unspecified reason" , "In an unspecified way" , "For an unknown reason; so who, me? (anag.)" .)