Crossword Genius

Groom races to grab one item of underwear (12)

Ross

I believe the answer is:

combinations

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

'groom races to grab one item of underwear' is the definition.
I can't tell whether this defines the answer.

'groom races to grab one' is the wordplay.
'groom' becomes 'comb' (combing is a way of grooming oneself).
'races' becomes 'nations' (I can't justify this - if you can you should believe this answer much more).
'to grab' indicates putting letters inside.
'one' becomes 'I' (Roman numeral).
'comb'+'nations'='combnations'
'combnations' enclosing 'i' is 'COMBINATIONS'.

Can you help me to learn more?

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app