Old copper's in to bring up files for Flying Squad? (3,6)

'flying squad?' is the definition.
(Red Arrows are an RAF aerobatics display team)

'old copper's in to bring up files' is the wordplay.
'old copper' becomes 'd'.
'in' means one lot of letters goes inside another.
'to bring up' becomes 'rear' (as in rearing children).
'files' becomes 'rows' (a file is a row of squares e.g. on a chess board).
'd' placed inside 'rear' is 'redar'.
'redar'+'rows'='RED ARROWS'

'for' acts as a link.