Remember Thai clutching old lace collar (6)

I believe the answer is:

bertha

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

'lace collar' is the definition.
(I've seen this in another clue)

'remember thai clutching' is the wordplay.
'clutching' indicates a hidden word.
'BERTHA' is hidden in the letters of 'remember thai'.

'old' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for bertha that I've seen before include "Female name; Big -, World War one German howitzer" , "Big girl" , "Woman's name" , "collar" , "Girl's name - big German WWI gun" .)

I've seen this clue in The Telegraph.

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