Crossword Genius

Add one litre, tap turning (11)

Ross

I believe the answer is:

interpolate

'add' is the definition.
(thesaurus)

'one litre tap turning' is the wordplay.
'turning' is an anagram indicator.
'one'+'litre'+'tap'='onelitretap'
'onelitretap' with letters rearranged gives 'INTERPOLATE'.

(Other definitions for interpolate that I've seen before include "Insert (between other terms of a series)" , "Insert - not a reptile (anag)" , "put in the middle" , "go-between?" .)

I've seen this clue in The Telegraph.
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