Coppers switch transport, gaining minor lead (5,6)
I believe the answer is:
small change
'coppers' is the definition.
(as in copper coins)
'switch transport gaining minor lead' is the wordplay.
I cannot really understand how this works, but
'switch' could be 'change' (synonyms) and 'change' is found in the answer.
'minor' could be 'small' (similar in meaning) and 'small' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for small change that I've seen before include "that's not enough for a new broom?" , "Pennies" , "Penny may be a part of this" , "loose cash" , "Coins of low value" .)