Crossword Genius

It can also fly on coal! (3)

Ross

I believe the answer is:

tit

I'm a little stuck... Click here to teach me more about this clue!

'fly on coal' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe there's an association between them I don't understand?

'it can' is the wordplay.
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'can' becomes 'it' (I can't justify this - if you can you should give a lot more credence to this answer).
't'+'it'='TIT'

'also' is the link.

Can you help me to learn more?

(Other definitions for tit that I've seen before include "Boob made backing" , "Small bird that lives off insects" , "What you swap for tat" , "Small songbird" , "18's [BIRD]" .)

I've seen this clue in the Evening Standard.
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