Finish breakfast at leisure, then lead on (5)
I believe the answer is:
tease
'lead on' is the definition.
(I've seen this in another clue)
'finish breakfast at leisure' is the wordplay.
'finish' suggests the final letters.
'at' says to put letters next to each other.
'leisure' becomes 'ease' (I've seen this before).
The final letter of 'breakfast' is 't'.
't'+'ease'='TEASE'
'then' is the link.
(Other definitions for tease that I've seen before include "Kid" , "Comb to remove tangles and open out the fibres" , "Gently make fun of (someone)" , "Torment for fun" , "Page of book" .)