Crossword Genius

Fat deposit a tricky matter (7,6)

Ross

I believe the answer is:

adipose tissue

'fat' is the definition.
(synonyms)

'deposit a tricky matter' is the wordplay.
'tricky' is an anagram indicator.
'matter' becomes 'issue' (synonyms).
'deposit'+'a'='deposita'
'deposita' with letters rearranged gives 'adiposet'.
'adiposet'+'issue'='ADIPOSE TISSUE'

(Another definition for adipose tissue that I've seen is " Cells that store fat".)

I've seen this clue in The Guardian.
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