See anything but frozen water (6)
I believe the answer is:
notice
'see' is the definition.
(thesaurus)
'anything but frozen water' is the wordplay.
'anything but' becomes 'not' (I've seen this in other clues).
'frozen water' becomes 'ice' (I've seen this before).
'not'+'ice'='NOTICE'
(Other definitions for notice that I've seen before include "Remark upon; small advertisement" , "'Observe, discern (6)'" , "warning to quit" , "Become aware of; review" , "Observe the placard or sign" .)