Fully prepared to study Irish poet, mostly covering time overseas at the outset (5-2-3)
I believe the answer is:
ready-to-eat
'fully prepared to study irish poet mostly' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'covering time overseas at the outset' is the wordplay.
I cannot quite understand how this works, but
'covering' could be 'toe' (toe is a kind of covering) and 'toe' is found in the answer.
'time' could be 'ad' (AD, Anno Domini, as opposed to BC, Before Christ) and 'ad' is present in the answer.
'at' is within the answer.
The remaining letters 'rey' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for ready-to-eat that I've seen is " Like takeaway food".)