Aid to following what's said on TV about blue tit aboard ship? (9)
I believe the answer is:
subtitles
'aid to following what's said on tv' is the definition.
I can't tell whether this definition defines the answer.
'about blue tit aboard ship?' is the wordplay.
'about' is an anagram indicator.
'aboard' means one lot of letters goes inside another.
'ship?' becomes 'SS' (prefix in ship names eg SS Great Britain).
'blue'+'tit'='bluetit'
'bluetit' anagrammed gives 'ubtitle'.
'ubtitle' put within 'ss' is 'SUBTITLES'.
Can you help me to learn more?
(Other definitions for subtitles that I've seen before include "Translations of foreign dialogue in a movie" , "Translation of foreign dialogue, in a movie say" .)