Getting stuck into pub food's a help for negotiator (10,5)

'a help for negotiator' is the definition.
(bargaining chips can be negotiated with)

'getting stuck into pub food's' is the wordplay.
'getting' becomes 'gaining' (to get is to gain or obtain).
'stuck into' indicates putting letters inside.
'pub' becomes 'bar' (both are drinking establishments).
'food's' becomes 'chips' (chip is a kind of food).
'bar'+'chips'='barchips'
'gaining' inserted within 'barchips' is 'BARGAINING CHIPS'.