Crossword Genius

Sweetheart not afraid to swallow head of lettuce (7)

Ross

I believe the answer is:

darling

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

'sweetheart' is the definition.
(both are terms of address to romantic partner)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for darling that I've seen before include "Wendy's family (Peter Pan)" , "family in play" , "Grace -, nineteenth century wreck heroine of lighthouse" , "Victorian heroine" , "Australian river and loved one" .)

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