Show some consideration for age (3)
I believe the answer is:
era
'age' is the definition.
(both can mean a long time)
'show some consideration' is the wordplay.
'show' becomes 'er' (US medical drama).
'some' indicates the central letters.
'consideration' becomes 'ear' (I've seen this in another clue).
The middle letter of 'ear' is 'a'.
'er'+'a'='ERA'
'for' acts as a link.
(Other definitions for era that I've seen before include "Special time" , "Long stretch" , "Age marked by a distinctive character" , "Characteristic period" , "Age of importance" .)