Third month at home before good travelling with army (8)
I believe the answer is:
marching
'travelling with army' is the definition.
I can't tell whether this definition defines the answer.
'third month at home before good' is the wordplay.
'third month' becomes 'march'.
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'before' says to put letters next to each other.
'good' becomes 'g' (abbreviation).
'march'+'in'+'g'='MARCHING'
Can you help me to learn more?
(Other definitions for marching that I've seen before include "Walking with regular steps in procession" , "Walking in time with regular steps" , "Walking like soldiers" , "Taking steps" .)