Gosh, about to take meal that’s substantial (5)
I believe the answer is:
meaty
'that's substantial' is the definition.
(I've seen this in another clue)
'gosh about to take' is the wordplay.
'gosh' becomes 'my' (both are old-fashioned expressions of surprise).
'about' means one lot of letters goes inside another.
'to take' becomes 'eat' (eat can mean to take in food).
'my' placed around 'eat' is 'MEATY'.
'meal' is the link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for meaty that I've seen before include "Fleshy - satisfying" , "Substantial, solid" , "Heavily built" , "Full of substance, flesh" , "Fleshy, or full of informative matter" .)