The most common and most likely answer to this crossword clue is the 9 letter word FARTHINGS
I've seen this crossword clue in The Daily Telegraph
F
A
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T
H
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More clues leading to the result FARTHINGS
Buddy explains!
The straight part
We know that "Use binoculars to see these/little old things with wrens on" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case use binoculars to see these/little old things with wrens on = farthings.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 FARTHINGS mean?
FARTHINGS noun- Former British unit of currency worth one-quarter of an old penny; or a coin representing this.
- A very small quantity or value; the least possible amount.
- A division of land.