The most common and most likely answer to this crossword clue is the 6 letter word MIDGET
I've seen this crossword clue in The Daily Telegraph
M
I
D
G
E
T
More clues leading to the result MIDGET
Buddy explains!
The straight part
We know that "certainly not a huge fellow" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case certainly not a huge fellow = midget.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MIDGET mean?
MIDGET noun- A little sandfly.
- Any small swarming insect similar to the mosquito; a midge.
- (sometimes offensive) A normally proportioned person with small stature, usually defined as reaching an adult height less than 4'10".
- (sometimes offensive) Any short person.
- A small version of something; miniature.