It can be played in hot or neutral style (4)
I believe the answer is:
horn
'style' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'it can be played in hot or neutral' is the wordplay.
I cannot really understand how this works, but
'hot' could be 'h' (abbreviation, eg on taps) and 'h' is found within the answer.
'or' is present in the answer.
'neutral' could be 'n' (abbreviation in electronics) and 'n' is found within the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for horn that I've seen before include "Instrument - rhino's appendage" , "Hooter" , "Head growth; cornucopia" , "Bony outgrowth on an animal" , "See 1 Across" .)