Behind the right ear (4)

I believe the answer is:

rear

'behind' is the definition.
(both can mean one's bottom)

'right ear' is the wordplay.
'right' becomes 'r' (abbreviation).
'r'+'ear'='REAR'

'the' is the link.

(Other definitions for rear that I've seen before include "Raise - back" , "Hindmost part" , "Rise up at the back" , "parent" , "Bring up or stand up on hind legs" .)

I've seen this clue in the Evening Standard.

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