Ordinary call for help by Oscar (2-2)
I believe the answer is:
so-so
'ordinary' is the definition.
(I've seen this before)
'call for help by oscar' is the wordplay.
'call for help' becomes 'sos' (I've seen this in another clue).
'by' is a charade indicator (letters next to each other).
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'sos'+'o'='SO-SO'
(Other definitions for so-so that I've seen before include "'Passable, middling (2-2)'" , "Tolerable, indifferent" , "Fair to middling" , "Indifferently good" , "Informally, only moderately good or well" .)