Wrongly interpret popular writer's pen-name, omitting 's' (7)

I believe the answer is:

misread

'wrongly interpret' is the definition.

'popular writer's pen-name omitting s' is the wordplay.
'popular writer's pen-name' becomes 'missread' (pseudonym of Dora Jessie Saint).
'omitting' is a deletion indicator.
'missread' with 's' taken away is 'MISREAD'.

(Other definitions for misread that I've seen before include "wrongly interpreted" , "Take the wrong way" .)

I've seen this clue in The Guardian.

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