Having enough vision to hold fifty, having put another one down (8)
I believe the answer is:
slighted
'one down' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs can occasionally define each other.
'having enough vision to hold fifty having put another' is the wordplay.
I cannot quite see how this works, but
'fifty' could be 'li' (I've seen this in other clues) and 'li' is found in the answer.
'another' could be 'e' (I've seen this in other clues) and 'e' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for slighted that I've seen before include "Insulted with delights" , "Offended" , "put down" , "Gave the cold shoulder to" .)