Daily Mail's leader to delight? (5)
I believe the answer is:
charm
'delight?' is the definition.
(I've seen this before)
'daily mail's leader' is the wordplay.
'daily' becomes 'char' (both can mean a cleaner).
'leader' indicates taking the first letters.
The first letter of 'mails' is 'm'.
'char'+'m'='CHARM'
'to' acts as a link.
(Other definitions for charm that I've seen before include "Power of fascination" , "Delight; magical object" , "Bewitch or delight" , "Delightfulness" , "For example, olde-worlde character" .)