Bar overturned before charge at the back (8)

I believe the answer is:

dorsally

'at the back' is the definition.
(dorsal refers to an animal's back)

'bar overturned before charge' is the wordplay.
'bar' becomes 'rod' (I've seen this before).
'overturned' says the letters should be written backwards.
'before' means one lot of letters go next to another.
'charge' becomes 'sally' (both can mean a military attack).
'rod' back-to-front is 'dor'.
'dor'+'sally'='DORSALLY'

(Another definition for dorsally that I've seen is " joining on near the back".)

I've seen this clue in The Telegraph.

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