Good little fellows make GIs? (6)
I believe the answer is:
grunts
'gis?' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.
'good little fellows' is the wordplay.
'good little' becomes 'g' (abbreviation for good).
'fellows' becomes 'runts' (I can't explain this - if you can you should give a lot more credence to this answer).
'g'+'runts'='GRUNTS'
'make' acts as a link.
Can you help me to learn more?
(Other definitions for grunts that I've seen before include "Makes noises like a pig" , "Makes noise like pig" , "Tropical fish" , "Noises like those of pigs" , "Makes snorting sound of pig" .)