The most common and most likely answer to this crossword clue is the 13 letter word NORTH-EASTERN
I've seen this crossword clue in The Times
N
O
R
T
H
-
E
A
S
T
E
R
N
Buddy explains!
The straight part
We know that "Like Tyneside" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like tyneside = north-eastern.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does NORTH-EASTERN mean?
NORTH-EASTERN adjective- Of, facing, situated in, or related to the north-east
- (of a wind) blowing from the north-east; north-easterly