Cryptic crossword clue
Energy invested in dubious English type of lens 7

The most common and most likely answer to this crossword clue is the 7 letter word FISHEYE

I've seen this crossword clue in The Daily Telegraph
F
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S
H
E
Y
E

Buddy explains!

The straight part
We know that "type of lens" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case type of lens = fisheye.
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 FISHEYE mean?

FISHEYE noun
  1. An unfriendly or suspicious glance.
  2. An undesirable effect in paint, particularly automotive finishes, normally caused by oil or other contaminants on the painted surface.
  3. An undesirable dull appearance in the table of a diamond that has been cut too shallow.
FISHEYE adjective
  1. (of a lens) Covering an extremely wide angle and producing a circular image that is distorted towards the edges.

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