What mature people pay to import eastern lace? (10)
I believe the answer is:
adulterate
'lace?' is the definition.
(thesaurus)
'what mature people pay to import eastern' is the wordplay.
I cannot quite understand how this works, but
'mature' could be 'adult' (similar in meaning) and 'adult' is found within the answer.
'pay' could be 'rate' (I've seen this in other clues) and 'rate' is present in the answer.
'eastern' could be 'e' and 'e' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for adulterate that I've seen before include "Doctor" , "Spoil" , "Reduce purity" , "Corrupt" , "Mix with a poorer substance" .)