Methinks there's no ink that contains a violet dye (5)
I believe the answer is:
meths
'contains a violet dye' is the definition.
I can't judge whether this definition defines the answer.
'methinks there's no ink' is the wordplay.
'there's no' indicates named letters should be taken away.
'methinks' with 'ink' taken away is 'METHS'.
'that' is the link.
Can you help me to learn more?
(Other definitions for meths that I've seen before include "Methylated spirits (colloq.)" , "unsuitable alcohol" , "Violet-coloured alcohol" , "Fuel" , "Spirit" .)