Cryptic crossword clue
Attempts overturning iron citadels 7

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

I've seen this crossword clue in The Daily Telegraph
E
F
F
O
R
T
S

Buddy explains!

The straight part
We know that "Attempts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case attempts = efforts.
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 EFFORTS mean?

EFFORTS noun
  1. The work involved in performing an activity; exertion.
  2. An endeavour.
  3. A force acting on a body in the direction of its motion.

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