Relish top northern booze (5,5)

I believe the answer is:

brown sauce

'relish' is the definition.
(I've seen this before)

'top northern booze' is the wordplay.
'top' becomes 'brow' (brow can mean a summit or peak).
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'booze' becomes 'sauce' (both can informally mean alcohol).
'brow'+'n'+'sauce'='BROWN SAUCE'

(Another definition for brown sauce that I've seen is " Relish".)

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