Cryptic crossword clue
They boost growth of young theatre audiences 11

The most common and most likely answer to this crossword clue is the 11 letter word GREENHOUSES

I've seen this crossword clue in The Daily Telegraph
G
R
E
E
N
H
O
U
S
E
S

Buddy explains!

The straight part
We know that "They boost growth" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they boost growth = greenhouses.
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 GREENHOUSES mean?

GREENHOUSES noun
  1. A building used to grow plants, particularly one with large glass windows or plastic sheeting to trap heat from sunlight even in intemperate seasons or climates.
  2. The glass of a plane's cockpit.
  3. A structure that shields the operating table to protect against bacteria.
  4. A hot state in global climate.

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