A ruse deployed by Ottoman retreat round a pickle (10)
I believe the answer is:
sauerkraut
'pickle' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Maybe there's an association between them I don't understand?
'a ruse deployed by ottoman retreat round a' is the wordplay.
'deployed' is an anagram indicator.
'by' means one lot of letters go next to another.
'ottoman' becomes 'turk' (I've seen this before).
'retreat' says the letters should be written in reverse.
'round' is an insertion indicator.
'turk' in reverse letter order is 'krut'.
'a'+'ruse'='aruse'
'aruse' anagrammed gives 'sauer'.
'sauer'+'krut'='sauerkrut'
'sauerkrut' placed around 'a' is 'SAUERKRAUT'.
Can you help me to learn more?
(Other definitions for sauerkraut that I've seen before include "Shredded cabbage fermented in brine" , "German pickled cabbage" , "German course" .)