Best pot I foolishly presented to old lady (7)
I believe the answer is:
optimum
'best' is the definition.
('optimum' can be similar in meaning to 'best')
'pot i foolishly presented to old lady' is the wordplay.
'foolishly' indicates an anagram.
'presented to' means one lot of letters go next to another.
'old lady' becomes 'mum' (I've seen this before).
'pot'+'i'='poti'
'poti' anagrammed gives 'opti'.
'opti'+'mum'='OPTIMUM'
(Other definitions for optimum that I've seen before include "Most favourable (conditions)" , "model" , "Most favourable point" , "Best (result)" , "Most appropriate" .)