Dob me in backwards for release from service (5)

I believe the answer is:

demob

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'release from service' is the definition.
(I've seen this before)

'dob me in backwards' is the wordplay.
'dob me' anagrams to 'DEMOB'.
But, I'm unsure how the anagram is indicated.

'for' is the link.

Can you help me to learn more?

(Other definitions for demob that I've seen before include "send off troops" , "Release from armed forces" , "Honourably discharge" , "Discharge soldiers (abbr.)" , "So happy to be leaving post" .)

I've seen this clue in the Sydney Morning Herald.

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