March past village shop at last, holding up tailors’ irons (5-4)

'march' is the definition.
(goose step is a kind of march)

'past village shop at last holding up tailors' irons' is the wordplay.
'at last' indicates one should take the final letters.
'holding up' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'tailors' irons' becomes 'gooses' (I can't justify this - if you can you should believe this answer much more).
The last letters of 'past village shop' are 'tep'.
'tep' put after 'gooses' is 'GOOSE-STEP'.

Can you help me to learn more?