Painful phase of tachycardia (4)

I believe the answer is:

achy

'painful' is the definition.
(similar in meaning)

'phase of tachycardia' is the wordplay.
'phase of' indicates the answer is hidden within the clue.
'ACHY' is hidden within 'tachycardia'.

(Other definitions for achy that I've seen before include "Causing steady dull pain" , "Feeling in need of an aspirin?" , "suffering dull pain" , "Hurting" , "discomfort" .)

I've seen this clue in The Times.

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