The most common and most likely answer to this crossword clue is the 6 letter word SIZING
I've seen this crossword clue in Financial Times
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Buddy explains!
The straight part
We know that "Measuring/using weak glue" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case measuring/using weak glue = sizing.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 SIZING mean?
SIZING verb- To adjust the size of; to make a certain size.
- To classify or arrange by size.
- To approximate the dimensions, estimate the size of.
- To take a greater size; to increase in size.
- (Cambridge University) To order food or drink from the buttery; hence, to enter a score, as upon the buttery book.
- To swell; to increase the bulk of.
- To apply glue or other primer to a surface which is to be painted.
- A gelatinous glue for glazing or sizing canvas, paper, plaster or wood; often made from animal skins.
- Paste
- (Cambridge University) food and drink ordered from the buttery by a student
- A weak glue used in various trades; size.