Untidy soldier with dry bananas (10)
I believe the answer is:
disorderly
'untidy' is the definition.
(similar in meaning)
'soldier with dry bananas' is the wordplay.
'with' says to put letters next to each other.
'bananas' indicates an anagram (informal term for mad).
'soldier' after 'dry' is 'drysoldier'.
'drysoldier' with letters rearranged gives 'DISORDERLY'.
(Other definitions for disorderly that I've seen before include "undisciplined" , "Companion of drunk" , "a mess" , "Lacking organisation" , "disturbance of the peace" .)