Our foe is wildly carrying clubs … and is this? (9)
I believe the answer is:
ferocious
'is this?' is the definition.
The definition suggests a singular noun but the answer is not.
'our foe is wildly carrying clubs' is the wordplay.
'wildly' indicates an anagram.
'carrying' indicates putting letters inside.
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'our'+'foe'+'is'='ourfoeis'
'ourfoeis' is an anagram of 'feroious'.
'feroious' enclosing 'c' is 'FEROCIOUS'.
'and' is the link.
(Other definitions for ferocious that I've seen before include "Savagely fierce" , "very intense" , "potentially harmful" , "Savagely cruel" , "Savage as a wild beast" .)