Crossword Genius

Lock phone given rental contract (7)

Ross

I believe the answer is:

ringlet

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'lock' is the definition.
(both can mean a piece of someone's hair)

'phone given rental contract' is the wordplay.
'phone' becomes 'ring' (synonyms).
'given rental contract' becomes 'let' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ring'+'let'='RINGLET'

Can you help me to learn more?

(Other definitions for ringlet that I've seen before include "sort of lock" , "Hair feature" , "Curling lock of hair" , "twist of sorts?" , "Curl, of an Irish dancer say" .)

I've seen this clue in The Sun.
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