Crossword Genius

Having set up gear, learner cooked, entertaining new sweetheart (10)

Ross

I believe the answer is:

girlfriend

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

'sweetheart' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for girlfriend that I've seen before include "date" , "Sweetheart" , "Female squeeze" , "Female companion" .)

I've seen this clue in The Times.
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