Crossword Genius

Bull or cow? Horse close (4,4)

Ross

I believe the answer is:

grey seal

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

'bull or cow?' is the definition.
I can't tell whether this definition defines the answer.

'horse close' is the wordplay.
'horse' becomes 'grey' (I've seen this before).
'close' becomes 'seal' (sealing is a kind of closing).
'grey'+'seal'='GREY SEAL'

Can you help me to learn more?

(Other definitions for grey seal that I've seen before include "N. Atlantic mammal" , "Sea creature" , "Marine mammal" , "North Atlantic mammal" .)

I've seen this clue in The Times.
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