One who’s given pledge with complete ease, we hear? (9)

I believe the answer is:

warrantee

'one who's given pledge' is the definition.
(person a warranty is given to)

'with complete ease we hear?' is the wordplay.
'with' becomes 'w' (abbreviation).
'complete' becomes 'arrant' (old-fashioned term meaning complete or utter).
'we hear?' shows a homophone (sound like).
'ease' sounds like 'ee'.
'w'+'arrant'+'ee'='WARRANTEE'

(Another definition for warrantee that I've seen is " One given certificate".)

I've seen this clue in The Times.

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