st 4266?

[tenflags]

14a: Sick at heart and head? It's due to gravity ((7)
S-D-E-S Could be sadness but don't get it . What and why please ? TVM

[cruciverbali]

Sick at heart = Sad

Head = Ness (Headland)

[tenderfoot]

Sadness

A "sad" ie undercooked cake for example will sink due to gravity.

Perhaps this is now old news!

[cancross]

I agree with cruciverbali, but "due to gravity" likely just means that one is sad (has sadness) due to "gravity" - i.e. seriousness or solemnity of a situation.