Crossword Genius

Groom seems pretty keen on the outside (5)

Ross

I believe the answer is:

preen

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

'groom' is the definition.
(a bird grooms itself by preening feathers)

'pretty keen on the outside' is the wordplay.
I cannot quite see how this works, but
'on' could be 're' ('on' can be mean 'with reference to') and 're' is present in the answer.
The remaining letters 'pen' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'seems' acts as a link.

Can you help me to learn more?

(Other definitions for preen that I've seen before include "Tidy and clean (plumage)" , "demonstrate pride" , "Groom with elaborate care" , "Titivate oneself" , "setdown straight?" .)

I've seen this clue in the Sydney Morning Herald.
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