Aspiring, with honour, to eclipse posh lord (5-2)
I believe the answer is:
would-be
'aspiring' is the definition.
(I've seen this before)
'with honour to eclipse posh lord' is the wordplay.
I cannot really see how this works, but
'with' could be 'w' (abbreviation) and 'w' is located in the answer.
'posh' could be 'u' (abbreviation for upper-class - opposite to non-U) and 'u' is found within the answer.
'lord' could be 'ld' (abbreviation for the aristocratic title) and 'ld' is located in the answer.
'honour' could be 'obe' (Order of the British Empire award) and 'obe' is found in the leftover letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for would-be that I've seen before include "Pretender" , "See 13" , "One aspiring to what they are not" , "Blew duo away for desiring or pretending" .)