The most common and most likely answer to this crossword clue is the 11 letter word GOLD-PLATED
I've seen this crossword clue in The Guardian
G
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Buddy explains!
The straight part
We know that "secure" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case secure = gold-plated.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 GOLD-PLATED mean?
GOLD-PLATED verb- To apply gold plate to an object, to plate with gold.
- (of projects) To incorporate costly or otherwise excessive features or refinements unnecessarily, to overengineer.
- (of laws, regulations, etc) To embellish, to extend beyond its intended scope, especially so as to become stifling, or rigid and inflexible.
- Having a thin layer of gold applied to the surface, often by electrolysis.
- (of projects, systems, etc.) Incorporating costly or otherwise excessive features or refinements unnecessarily; overengineered.
- (of laws, regulations, etc.) Embellished to excess, especially so as to be stifling, or rigid and inflexible.