Wait to check that mother has got in (6)
I believe the answer is:
remain
'wait' is the definition.
(thesaurus)
'check that mother has got in' is the wordplay.
I cannot quite see how this works, but
'mother' could be 'ma' (Ma is another word for mother or mum) and 'ma' is located in the answer.
'check' could be 'rein' (both can mean to control or limit) and 'rein' is present in the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for remain that I've seen before include "Stay behind" , "Stay on after others have gone" , "Stay (in a place)" , "Continue in position" , "Last" .)