Tiresomely long weekend - Lessing's to some extent (7)

I believe the answer is:

endless

'tiresomely long' is the definition.
(I've seen this before)

'weekend lessing's to some extent' is the wordplay.
'to some extent' indicates a hidden word.
'ENDLESS' is hidden in the letters of 'weekend lessing'.

(Other definitions for endless that I've seen before include "Tiresomely long" , "Everlasting" , "Occurring so frequently so as to seem uninterrupted" , "permanent" , "Without limit" .)

I've seen this clue in The Telegraph.

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