Heart - inner organ (3)

I believe the answer is:

ear

'organ' is the definition.
(the ear is an organ)

'heart inner' is the wordplay.
'inner' indicates a hidden word (I've seen 'in' mean this).
'EAR' is hidden within 'heart'.

(Other definitions for ear that I've seen before include "Fruiting head of a cereal" , "Ability to recognise sounds" , "Seed-bearing spike" , "Part of corn plant" , "Bit of corn" .)

I've seen this clue in the Sydney Morning Herald.

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