Crossword Genius

Acid spattered under wheels of an organ (7)

Ross

I believe the answer is:

cardiac

'of an organ' is the definition.
(relating to the heart, an organ)

'acid spattered under wheels' is the wordplay.
'spattered' indicates an anagram.
'under' is a charade indicator (letters next to each other).
'wheels' becomes 'car' (car wheel is a kind of wheel).
'acid' anagrammed gives 'diac'.
'diac' after 'car' is 'CARDIAC'.

(Other definitions for cardiac that I've seen before include "Physiologically, of the heart" , "Relating to the heart" , "Pertaining to the heart" , "Sort of surgery" , "Appertaining to the heart" .)

I've seen this clue in The Times.
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