Man disembowelled by fish is in grave state (6)
I believe the answer is:
solemn
'grave state' is the definition.
'solemn' can be an answer for 'grave' (I've seen this before). I'm unsure of the 'state' bit.
'man disembowelled by fish' is the wordplay.
'disembowelled' suggests removing the centre.
'by' says to put letters next to each other.
'fish' becomes 'sole' (sole is a kind of fish).
'man' with its centre taken out is 'mn'.
'mn' after 'sole' is 'SOLEMN'.
'is in' acts as a link.
Can you help me to learn more?
(Other definitions for solemn that I've seen before include "'Earnest, grave (6)'" , "Sober and serious" , "gloomy" , "pious" , "'Dignified, sombre (6)'" .)