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I had to return Spider? Most awful! (6)

Ross

I believe the answer is:

direst

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'most awful' is the definition.
('dire' can be a synonym of 'awful')

'i had to return spider?' is the wordplay.
'i had' becomes 'i'd' (contraction).
'to return' is a reversal indicator.
'spider?' becomes 'rest' (I can't explain this - if you can you should give a lot more credence to this answer).
'id' back-to-front is 'di'.
'di'+'rest'='DIREST'

Can you help me to learn more?

(Other definitions for direst that I've seen before include "Most horrific" , "far from ideal" .)

I've seen this clue in The Sunday Times and The Times.
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