Strangely unrecognisable without being criminal (9)
I believe the answer is:
larcenous
'criminal' is the definition.
(I've seen this before)
'strangely unrecognisable without being' is the wordplay.
'strangely' indicates an anagram.
'without' indicates named letters should be taken away.
'unrecognisable' with 'being' removed is 'urconsale'.
'urconsale' with letters rearranged gives 'LARCENOUS'.
(Other definitions for larcenous that I've seen before include "Thievish" , "thieving" , "Like other crimes" , "Relating to theft" , "With sticky fingers" .)