Just beginning to go back at a gentle trot (3)

I believe the answer is:

jog

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'trot' is the definition.
(I know that trot can be written as jog)

'just beginning to go back at a gentle' is the wordplay.
'beginning to' says to take the initial letters.
'back' says to take the final letters (the letter at the back).
'at' means one lot of letters go next to another.
'a gentle' becomes 'g' (this could be a standard abbreviation of which I'm unaware).
The first letter of 'just' is 'j'.
The last letter of 'go' is 'o'.
'j'+'o'+'g'='JOG'

Can you help me to learn more?

(Other definitions for jog that I've seen before include "Trot" , "exercise?" , "Run at a leisurely pace" , "Reminder" , "Run for fun" .)

I've seen this clue in the Evening Standard.

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