One might tell the future English novelist, one being held back (10)

I believe the answer is:

forecaster

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'one might tell the future' is the definition.
(a forecaster tries to tell the future)

'english novelist one being held back' is the wordplay.
'english novelist' becomes 'Forster' (EM Forster, e879-e970).
'one being held' is an insertion indicator.
'back' becomes 'eca' (I can't justify this - if you can you should believe this answer much more).
'forster' placed around 'eca' is 'FORECASTER'.

Can you help me to learn more?

(Other definitions for forecaster that I've seen before include "Predicter (of, eg, weather)" , "Prognosticator" , "One predicting the future" .)

I've seen this clue in The Times.

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