Nowadays treat it as comparable with plenty (8)
I believe the answer is:
adequate
'plenty' is the definition.
(I've seen this before)
'nowadays treat it as comparable' is the wordplay.
I cannot really see how this works, but
'nowadays' could be 'ad' (AD, Anno Domini, as opposed to BC, Before Christ) and 'ad' is located in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found within the answer.
'as' could be 'qua' (I've seen this before) and 'qua' is present in the answer.
The remaining letters 'ee' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'with' acts as a link.
Can you help me to learn more?
(Other definitions for adequate that I've seen before include "Barely sufficient" , "Passable; enough" , "up to the job?" , "plenty" , "Just about sufficient, acceptable" .)