A little bit of luck at last - two days off! (7)
I believe the answer is:
weekend
'two days off' is the definition.
'a little bit of luck at last' is the wordplay.
'a little bit of' becomes 'wee'.
'luck at' becomes 'k' (I can't justify this - if you can you should believe this answer much more).
'last' becomes 'end' (I've seen this in another clue).
'wee'+'k'+'end'='WEEKEND'
Can you help me to learn more?
(Other definitions for weekend that I've seen before include "See 21" , "Occasional" , "Sat. and Sun." , "couple of days" , "time for game?" .)