TV format popular among unhappy types (10)

I believe the answer is:

miniseries

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'unhappy types' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'tv format popular among' is the wordplay.
'tv format' becomes 'miseries' (I can't justify this - if you can you should believe this answer much more).
'popular' becomes 'in' ('in' can mean trendy).
'among' means one lot of letters goes inside another (inserted letters are placed among others).
'miseries' placed around 'in' is 'MINISERIES'.

Can you help me to learn more?

(Other definitions for miniseries that I've seen before include "TV programme" , "TV programmes?" .)

I've seen this clue in The Times.

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