Still, the abominable snowman has no tail (3)
I believe the answer is:
yet
'still' is the definition.
(synonyms)
'the abominable snowman has no tail' is the wordplay.
'the abominable snowman' becomes 'yeti' (I've seen this in another clue).
'has no tail' means to remove the last letter.
'yeti' with its last letter removed is 'YET'.
(Other definitions for yet that I've seen before include "Though; still" , "Up to this time and continuing" , "in spite of that" , "Still, even" , "Still, so far" .)