Cope badly tackling army manual (4,4)

'manual' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'cope badly tackling army' is the wordplay.
'badly' indicates an anagram (letters in the wrong order).
'tackling' is an insertion indicator (to tackle is to take possession of).
'army' becomes 'host' (host is a kind of army).
'cope' with letters rearranged gives 'ecop'.
'ecop' enclosing 'host' is 'ECHO STOP'.

Can you help me to learn more?