Firmly fixed or attached (4)

I believe the answer is:

fast

This clue is a double definition.

'firmly fixed' is the first definition.
(I've seen this before)

'attached' is the second definition.
(thesaurus)

(Other definitions for fast that I've seen before include "Starve; quick" , "'Quickly, rapidly (4)'" , "Express" , "Dissolute" , "Firm < moving rapidly" .)

I've seen this clue in The Sun.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.