Street trader's outstanding period plugging a type of eel (12)
I believe the answer is:
costermonger
'street trader's outstanding period plugging a type of eel' is the definition.
I can't judge whether this definition defines the answer.
'outstanding period plugging a type of eel' is the wordplay.
'outstanding' becomes 'os' (accounting abbreviation).
'period' becomes 'term' (term is a kind of period).
'plugging' indicates putting letters inside (inserted letters plug up a gap in the word).
'a type of eel' becomes 'conger' ().
'os'+'term'='osterm'
'osterm' inserted within 'conger' is 'COSTERMONGER'.
Can you help me to learn more?
(Other definitions for costermonger that I've seen before include "Fruit/veg seller" , "Old hawker of fruit and veg - corners got me (anag)" , "Barrow boy" , "Fruit and veg seller" .)