Follow tips from sports trainers and reveal heavenly body (3,4)
I believe the answer is:
dog star
'heavenly body' is the definition.
(Dog Star is an example)
'follow tips from sports trainers and reveal' is the wordplay.
'follow' becomes 'dog' (I've seen this in another clue).
'tips from' indicates taking the first letters.
The first letters of 'sports trainers and reveal' is 'star'.
'dog'+'star'='DOG-STAR'
(Other definitions for dog star that I've seen before include "night-spot, getting high" , "Sirius in the sky" , "Part of 8 [CANIS MAJOR]" , "Drags to find other name for Sirius" , "slightly flashy night-spot?" .)