Crossword Genius

Good uniform one found tossed in vermin-infested tip (8)

Ross

I believe the answer is:

gratuity

'tip' is the definition.
(I know that tip can be written as Gratuity)

'good uniform one found tossed in vermin-infested' is the wordplay.
'good' becomes 'g' (abbreviation).
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'one' becomes 'I' (Roman numeral).
'found tossed in' means one lot of letters goes inside another.
'vermin-infested' becomes 'ratty' (infested with rats).
'u'+'i'='ui'
'ui' put inside 'ratty' is 'ratuity'.
'g'+'ratuity'='GRATUITY'

(Other definitions for gratuity that I've seen before include "Tip (to waiter)" , "present" .)

I've seen this clue in The Times.
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