Drunken son in mummy's leggings? (6)

I believe the answer is:

tights

I'm a little stuck... Click here to teach me more about this clue!

'mummy's leggings?' is the definition.
'tights' can be an answer for 'leggings?' (I have seen 'Female leggings' mean 'tights' so perhaps 'leggings' could also mean 'tights'). I am not certain of the 'mummy's' bit.

'drunken son' is the wordplay.
'drunken' becomes 'tight' (I've seen this in other clues).
'son' becomes 's' (genealogical abbreviation for son).
'tight'+'s'='TIGHTS'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for tights that I've seen before include "Female leggings" , "Types of stockings" , "Women's garments" , "Film '25: Men in --'" , "Nether garments for women or acrobats (6)" .)

I've seen this clue in The Independent.

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.