Fragment of chinos largely turned up to boot (4)
I believe the answer is:
also
'to boot' is the definition.
(I've seen this before)
'fragment of chinos largely turned up' is the wordplay.
'fragment of' says the answer is hidden in the clue (I've seen this in other clues).
'turned up' says the letters should be written backwards.
'osla' is hidden in the letters of 'chinos largely'.
'osla' back-to-front is 'ALSO'.
(Other definitions for also that I've seen before include "Item" , "Old" , "an indication of more to come" , "Likewise" , "'Besides, moreover (4)'" .)