As he’s gone into the ends of rampart, it’s most risky (7)
I believe the answer is:
rashest
'most risky' is the definition.
Both the answer and definition are superlative adjectives. Perhaps there's a link between them I don't understand?
'as he's gone into the ends of rampart' is the wordplay.
'he's gone' becomes 'hes' (I am not sure about this - if you are sure you should believe this answer much more).
'into' is an insertion indicator.
'the ends of' means to remove the middle letters.
'rampart' with its centre taken out is 'rt'.
'as'+'hes'='ashes'
'ashes' inserted inside 'rt' is 'RASHEST'.
'it's' is the link.
Can you help me to learn more?
(Other definitions for rashest that I've seen before include "Most adventurous" , "Most foolhardy" , "Most reckless" , "Most impetuous" .)