Crossword Genius

Easy to lose head in defeat (4)

Ross

I believe the answer is:

lick

Here is my best explanation:

'defeat' is the definition.
(thesaurus)

'easy to lose head' is the wordplay.
'easy' becomes 'slick'.
'to lose head' means to remove the first letter.
'slick' with its initial letter removed is 'LICK'.

'in' is the link.

This clue was last seen in The Telegraph