Cautious, limiting on and off white wine (10)
I believe the answer is:
chardonnay
'white wine' is the definition.
(Chardonnay is an example)
'cautious limiting on and off' is the wordplay.
'cautious' becomes 'chary' (similar in meaning).
'limiting' means one lot of letters goes inside another.
'off' indicates an anagram.
'on'+'and'='onand'
'onand' anagrammed gives 'donna'.
'chary' going around 'donna' is 'CHARDONNAY'.
(Other definitions for chardonnay that I've seen before include "White wine grape" , "Variety of white wine" , "drink" .)