Queen, say, regularly represented in charts (3)

I believe the answer is:

cat

'queen say' is the definition.
(queen is a kind of cat)

'regularly represented in charts' is the wordplay.
'regularly represented in' indicates alternate letters.
The alternating letters of 'charts' are 'CAT'.

(Other definitions for cat that I've seen before include "See 21" , "Lash < jazz fan" , "Common pet" , "Animal; converter; boat" , "Moggy" .)

I've seen this clue in The Times.

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