The most common and most likely answer to this crossword clue is the 4 plus 7 letter word ONLY CONNECT
I've seen this crossword clue in The Times
O
N
L
Y
C
O
N
N
E
C
T
Buddy explains!
The straight part
We know that "seen in this TV programme?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case seen in this tv programme? = only connect.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.