Celebrity magazine dismissing mother in revealing daydream (8)
I believe the answer is:
stargaze
'daydream' is the definition.
(I know that daydream can be written as stargaze)
'celebrity magazine' is the wordplay.
'celebrity' becomes 'star' (I've seen this in another clue).
'magazine' becomes 'gaze' (I can't justify this - if you can you should give a lot more credence to this answer).
'star'+'gaze'='STARGAZE'
'dismissing mother in revealing' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
(Other definitions for stargaze that I've seen before include "Watch the heavens" , "Look at the heavens" , "looking up to our luminaries?" , "Study horoscope" , "Daydream" .)