Indifferent Ringo at the back accompanying Help! (2-2)
I believe the answer is:
so-so
'indifferent' is the definition.
(I've seen this before)
'ringo at the back accompanying help' is the wordplay.
'at the back' indicates one should take the final letters (the letter at the back).
'accompanying' is a charade indicator (letters next to each other).
'help' becomes 'SOS' (emergency abbreviation SOS).
The final letter of 'ringo' is 'o'.
'o' put after 'sos' is 'SO-SO'.
(Other definitions for so-so that I've seen before include "Rather middling" , "Tolerable, indifferent" , "Indifferently good" , "Of middling quality" , "Informally, only moderately good or well" .)