The physical part of a money order (4)

I believe the answer is:

lobe

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'the physical part' is the definition.
'lobe' can be an answer for 'part' (lobe is a kind of part). I'm unsure of the 'the physical' bit.

'a money order' is the wordplay.
'a money' becomes 'l' (L can mean 'pounds').
'order' becomes 'obe' (Order of the British Empire award).
'l'+'obe'='LOBE'

'of' is the link.

Can you help me to learn more?

(Other definitions for lobe that I've seen before include "Base of ear" , "Lower part of the ear" , "Fleshy part of the ear (4)" , "Leaf division" , "part of brain" .)

I've seen this clue in the Evening Standard.

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