Master follows athletic sidekick to find Tardis, say (7)
I believe the answer is:
acronym
'find tardis say' is the definition.
I can't judge whether this definition defines the answer.
'master follows athletic sidekick' is the wordplay.
'master' becomes 'm'.
'follows' says to put letters next to each other.
'athletic' becomes 'a' (this might be a standard abbreviation which I don't know about).
'sidekick' becomes 'crony' ('crony' can be a synonym of 'sidekick').
'a'+'crony'='acrony'
'm' put after 'acrony' is 'ACRONYM'.
'to' is the link.
Can you help me to learn more?
(Other definitions for acronym that I've seen before include "eg RADA" , "quango, perhaps" , "Word formed from initial letters of other words." , "Eg, Nato, Sars" , "Word formed from initials" .)