Concentrated tennis out East (7)
I believe the answer is:
intense
'concentrated' is the definition.
(similar in meaning)
'tennis out east' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'east' becomes 'e' (abbreviation).
'tennis' anagrammed gives 'intens'.
'intens'+'e'='INTENSE'
(Other definitions for intense that I've seen before include "amplified?" , "Acute, vivid" , "Acute difficulty" , "Extremely emotional" , "Fierce - deep" .)