Girl flips and dons new suit (8)
I believe the answer is:
diamonds
'suit' is the definition.
(I've seen this before)
'girl flips and dons new' is the wordplay.
'girl' becomes 'maid' (maid is a kind of girl).
'flips' says the letters should be written in reverse.
'and' means one lot of letters go next to another.
'new' indicates anagramming the letters.
'maid' backwards is 'diam'.
'dons' with letters rearranged gives 'onds'.
'diam'+'onds'='DIAMONDS'
(Other definitions for diamonds that I've seen before include "where some Americans find sporting action" , "Maids don these gems" , "Precious stones found amid nods" , "Red cards" , "rocks?" .)