The most common and most likely answer to this crossword clue is the 13 letter word CONGLOMERATES
C
O
N
G
L
O
M
E
R
A
T
E
S
More clues leading to the result CONGLOMERATES
Buddy explains!

The straight part
We know that "Industrial groups" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case industrial groups = conglomerates.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 CONGLOMERATES mean?
CONGLOMERATES noun- A cluster of heterogeneous things.
- A corporation formed by the combination of several smaller corporations whose activities are unrelated to the corporation's primary activity.
- A rock consisting of gravel or pebbles embedded in a matrix.