Single charger, for instance, is small for a town (3-5)
I believe the answer is:
one-horse
'instance is small for a town' is the definition.
I can't tell whether this definition defines the answer.
'single charger' is the wordplay.
'single' becomes 'one' (a single thing - only one).
'charger' becomes 'horse' (I've seen this before).
'one'+'horse'='ONE-HORSE'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for one-horse that I've seen before include "Small, like a buggy?" , "Small and remote, town perhaps" , "Small town, with only one quadruped?" , "(Of a town) having few facilities" , "With only a single equine, the town is very small" .)