Brief delight, certainly, getting prize (8)
I believe the answer is:
treasure
'prize' is the definition.
(I know that prize can be written as treasure)
'brief delight certainly getting' is the wordplay.
'brief' means to remove the last letter (a shorter or briefer version of the word).
'delight' becomes 'treat' (I've seen this in another clue).
'certainly' becomes 'sure' (synonyms).
'getting' means one lot of letters go next to another.
'treat' with its final letter removed is 'trea'.
'trea'+'sure'='TREASURE'
(Other definitions for treasure that I've seen before include "... Island (R.L.Stevenson)" , "masterpiece?" , "Value highly" , "much-loved person" , "Highly-prize a possession" .)