Ross gets off steroids - the current trend suggesting it has a yo-yo effect (4)
I believe the answer is:
tide
'ross gets off steroids the current trend' is the definition.
I can't judge whether this defines the answer.
'it has a yo-yo effect' is the wordplay.
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'has' is a charade indicator (letters next to each other).
'a yo-yo effect' becomes 'ide' (I can't justify this - if you can you should believe this answer much more).
't'+'ide'='TIDE'
'suggesting' acts as a link.
Can you help me to learn more?
(Other definitions for tide that I've seen before include "Ocean movement" , "Movement of seawater" , "In the main, movement" , "(With time) it waits for no man" , "Ocean phase" .)