The most common and most likely answer to this crossword clue is the 5 letter word WAFER
I've seen this crossword clue in The Times
W
A
F
E
R
More clues leading to the result WAFER
- Fighting to swallow iron biscuit!
- Very slight force fluctuating in the raw outside
- Host's foe disembowelled in combat
- Biscuit ends in hollow area of the floor
- Thin piece of iron used in fighting
- Fighting to get hold of iron that’s very thin
- Biscuit produced in a mass
- Thin biscuit a few baked with recipe
- Rambling talker not following lecturer produced thin stuff
- Thin disc made of iron used in fighting
Buddy explains!

The straight part
We know that "Very slight" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case very slight = wafer.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 WAFER mean?
WAFER noun- A light, thin, flat biscuit/cookie.
- (christianity) A thin disk of consecrated unleavened bread used in communion.
- A soft disk originally made of flour, and later of gelatin or a similar substance, used to seal letters, attach papers etc.
- A thin disk of silicon or other semiconductor on which an electronic circuit is produced.
- To seal or fasten with a wafer.